Table 4. Correlation of Droplet Number Error With Important Aerosol-Cloud Interaction Propertiesa

Observed Property	Correlation Coefficient (R2)
	Whole Data Set	Non-Power-Plant	Power Plant Only
Total aerosol number	0.002	0.018	0.111
Accumulation mode aerosol number	0.002	0.043	0.198
Cloud updraft velocity	0.358	0.500	0.209
Updraft velocity standard deviation	0.150	0.383	0.066
Cloud droplet number	0.067	0.343	0.014
Aerosol sulfate mass fraction	0.025	0.036	0.014

aThe parcel model was used for computing cloud droplet number. Strongest correlations are shown in bold.